/**
 * Created with IntelliJ IDEA.
 * User: Hkkkk Guo
 * Date: 2023/2/9
 * Time: 12:06
 * Description:
 */
package com.hangkai.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.hangkai.reggie.common.BaseContext;
import com.hangkai.reggie.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@WebFilter(filterName = "LoginCheckilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器 支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1 获取本次的请求URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求: {}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        // 2 判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        // 3 如果不需要处理 直接放行
        if (check){
            log.info("本次请求不需要处理 {}", request);
            filterChain.doFilter(request, response);
            return;
        }
        // 4.1 判断后台用户登录状态 如果已登录 放行
        if(request.getSession().getAttribute("employee") != null){

            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

//            log.info("员工已登录  用户id为{}", request.getSession().getAttribute("employee"));
//            Long id = Thread.currentThread().getId();
//            log.info("当前线程id1 {}", id);

            filterChain.doFilter(request, response);
            return;
        }

        // 4.2 判断移动用户登录状态 如果已登录 放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录  用户id为{}", request.getSession().getAttribute("user"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request, response);
            return;
        }
        // 5 如果没登录 返回未登录结果  通过输出流方式向客户端页面相应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));
    }

    public boolean check(String[] urls, String requestUrl) {
        boolean flag = false;
        for (String url : urls) {
            flag = PATH_MATCHER.match(url, requestUrl);
            if(flag)break;
        }
        return flag;
    }
}
